Ozonation of pyrene and benzo[a]pyrene in silica and soil –14C-mass balances and chemical analysis of oxidation products as a first step to ecotoxicological evaluation |
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Authors: | M Eberius Anne Berns Ingolf Schuphan |
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Institution: | Lehrstuhl für Biologie V, ?kologie, ?kotoxikologie, ?kochemie, Rheinisch-Westf?lische Technische Hochschule Aachen, Worringerweg 1, D-52056 Aachen, Germany, DE
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Abstract: | Ozonation of polycyclic aromatic hydrocarbons (PAHs) in soil is a process that can be used for in-situ soil remediation or in combination with bioremediation techniques. First steps to a comprehensive ecotoxicological evaluation of this method is done by ozonation of radioactively labeled (14C) pyrene and benzoa]pyrene in a silty soil (LUFA 2.2) under mass-balancing conditions and GC-MS analysis of aromatic ozonation products. 14C-Mass-balances for pyrene and benzoa]pyrene (ba]p) in soil showed that, apart from 14CO2 formation, considerable percentages of both PAHs are oxidized to water soluble substances (20–30%) or to non-extractable or bound residues (10% for pyrene, 30% for ba]p). TLC and GC-MS analysis of ozonation products extractable from artificially contaminated silica and soil by organic solvents revealed a large number of aromatic substances. PAH-quinones and ten ring fission products with formyl- and carboxy-groups of both pyrene and ba]p could be identified. |
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